ebay is a simple place. You list for what you want to sell, buyers look to pay x. When you have a match, you have a sale!
I have no bone to pick with another trying to make a buck. I buy and sell, some you win, some you lose. I have sold plenty of items to "dealers" at a price. I got what I thought I could get and was happy, if they sell it for more, more power to them!
I buy, collect, accumulate and sell, its all good to me and fun to boot.
One thing that will never register with me is to begrudge someone else trying to make a buck. Sure there are shysters out there, but just like buyer beware, seller should know their product and its worth.
TD